Have you written this sentence yourself, Jehane Ibrahim? If not, please state its source and author.
Are you asking for our opinion on the grammar or the scientific content of it?
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You cannot continue to give your threads the same, unhelpful title. A better and more eye-catching title for this would have been The brain tissues of mice.
Extract from the Posting Guidelines:
'Thread titles should include all or part of the word/phrase being discussed.'
Student or Learner